import math

class Circle:
    radius = 5
    
    def get_perimeter(self):
        perimeter = 2 * math.pi * self.radius
        return perimeter
    
    def get_area(self):
        area = math.pi * self.radius ** 2
        return area

# 创建Circle类的对象
circle = Circle()
perimeter = circle.get_perimeter()
area = circle.get_area()

print(f"圆的周长是：{perimeter:.2f}")
print(f"圆的面积是：{area:.2f}")
